01 Record

CVE-2021-47641

video: fbdev: cirrusfb: check pixclock to avoid divide by zero

MediumPUBLISHEDCNA: Linux

CNA base score5.5 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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02 Description

video: fbdev: cirrusfb: check pixclock to avoid divide by zero

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 16.6% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-02-26 01:54Z1 YR AGO

Last updated

2026-05-11 13:58Z5 MO AGO

Reserved

2025-02-26

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-369Divide By ZeroBase

Data version

5.2

Document digest

d145e939506a2558d21389fb102fea7abdc687799cae40d0eb5526e3f9a43f33

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c656d04247a2654ede5cead2ecbf83431dad5261, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 40b13e3d85744210db13457785646634e2d056bd, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 53a2088a396cfa1da92690a1da289634cd73bf0d, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 8c7e2141fb89c620ab4e41512e262fbf25b8260d, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6fe23ff94e7840097202e85c148688940b37c9b1, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 45800c42ef000f417270bcfc08630e42486fca99, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < e498b504f8c81b07efab9febf8503448de4dc9cf, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 5c6f402bdcf9e7239c6bc7087eda71ac99b31379, 2.6.12—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261
git.kernel.orghttps://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135
git.kernel.orghttps://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd
git.kernel.orghttps://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d
git.kernel.orghttps://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d
git.kernel.orghttps://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1
git.kernel.orghttps://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99
git.kernel.orghttps://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf
git.kernel.orghttps://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379

07 Fixed in

Debian 12

linux
Fixed in 5.17.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 5.17.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 5.17.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.